Hello,
2011/6/2 Itay <deb...@itayf.fastmail.fm>
> On Mon, 30 May 2011, Itay wrote:
>
> I'd like to set up a USB drive using LVM. Could someone knowledgable
>> confirm that the following recipe should allow me to hot-plug the USB drive
>> without rendering the LVM file-systems inaccessible?
>>
>
> The recipe has a problem in the vgcreate step (below,
> marked with '***********').
> The physical volume is not listed in /dev/disk/by-uuid/...
>
> Can someone suggest how to fix the recipe, or suggest a different workflow
> for working with lvm on hot-pluggable USBs?
>
>
Actually, you should be able to use the partitions directly to create the
VG. An example that applies to your case is even in the manpage of vgcreate:
EXAMPLES
To create a volume group named test_vg using physical volumes
/dev/sdk1, and /dev/sdl1 with default physical extent size of 4MB:
vgcreate test_vg /dev/sdk1 /dev/sdl1
Thus, as alternative to the vgcreate and vgextend steps, the following
command should do it in a single step:
- pvcreate myVG 7dev/sdc1 /dev/sdc2
Regards,
Roland
Recipe follows:
>>
>> Set up:
>> # (Actual number of partitions, etc., is not important here.)
>>
>> # Assume attached disk is /dev/sdc and it has an extended partition #+
>> that covers that whole disk.
>>
>> # Prepare partitions for LVM (say, 2 partitions)
>> $ parted /dev/sdc mkpart logical START1 END1
>> $ parted /dev/sdc mkpart logical START2 END2
>> # Create Physical Volumes
>> $ pvcreate /dev/sdc1
>> $ pvcreate /dev/sdc2
>> # Identify the Physical Volumes' UUIDs
>> $ blkid
>> # Create Volume Groups using PVs **UUIDs**
>>
> ***********'
>
>> $ vgcreate [options] myVG /dev/disk/by-uuid/UUID-OF-PART-1
>>
> ***********'
>
>> $ vgexted [options] myVG /dev/disk/by-uuid/UUID-OF-PART-2
>> # From this point I can "forget" that I deal with a USB drive, and #+
>> continue the set up as with built in drives; right?
>>
>
> [snip]
>
> Thanks,
> Itay
>
>
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